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Stock Compensation - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock based compensation expense $ 411 $ 227 $ 531 $ 230
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock based compensation expense 45 176 122 231
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock based compensation expense $ 366 $ 51 $ 409 $ (1)